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the north american analog cellular radio system uses fm with channels 30 khz wide suppose such a channel were used for
ten voice signals are to be multiplexed and transmitted the analog signal occupies 4 khz of bandwidth and can be
what is the proportion of overhead in a basic rate isdn signal assume the d channel is part of the overhead compare
the local loop has a resistance of 650 ohms and the telephone instrument has a ringer voltage of 80 volts when the
suppose the voltage across a telephone line at the subscriber drops from 48 v to 10 v when the phone goes off hook if
a transmitter delivers 50 w into a 600- lossless line terminated with an antenna that has an impedance of 275
a 75- source is connected to a 50- load a spectrum analyzer with a length of 75- line the source produces 10 mw all
an open-circuited line is 075 wavelengths longa sketch the incident reflected and resultant voltage waveforms at the
a generator is connected to a short-circuited line 125 wavelengths longa sketch the waveforms for the incident
repeat problem 1 for waves on a coaxial cable with a solid polyethylene dielectricproblem 1find the wavelength for
calculate the characteristic impedance of a coaxial line with a polyethylene dielectric if the diameter of the inner
a transmitter with an output power of 50 w is connected to a matched load by means of 32 m of matched coaxial cable it
for a 10-ghz signal in rg-52u waveguide described in problem 17 calculatea the phase velocityb the group velocityc the
a signal with a power of 10 mw enters port 1 of a directional coupler the output power is 7 mw at port 2 and 100 microw
a draw a sketch showing how a hybrid tee could be used to connect a transmitter and a receiver to the same antenna in
a transmission line of unknown impedance is terminated with two different resistances and the swr is measured each time
state the difference between power and power density explain why power density decreases with the square of the
a pcs signal at 19 ghz arrives at an antenna via two paths differing in length by19 ma calculate the difference in
a satellite transmitter operates at 4 ghz with an antenna gain of 40 dbi the receiver 40000 km away has an antenna gain
a transmitter has an output power of 50 w it is connected to its antenna by a feedline that is 25 meters long and
a certain antenna has a gain of 7 db with respect to an isotropic radiatora what is its effective area if it operates
an isotropic source radiates 100 w of power in free space at a distance of 15 km from the source calculate the power
what is meant by a collinear antenna sketch such an antenna and its radiation pattern and classify it as broadside or
sketch the radiation patterns of an isotropic antenna and of a half-wave dipole in free space and explain why a dipole
a map indicates that a certain spot on the earth is in the 40 dbw contour of a satellite beam that is the eirp from the